Applications of carbonic acid solution for developing conversion coatings on Mg alloy
Works on exploring an environmentally clean method for producing an Mg,Al-hydrotalcite (Mg(6)Al(2)(OH)(16)CO(3)center dot 4H(2)O) layer and/or calcium carbonate (CaCO(3)) layer on Mg alloy in a carbonic acid solution system (aqueous HCO(3)(-)/CO(3)(2-) or Ca(2+)/HCO(3)(-)) at 50 degrees C were revie...
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ftnchunghsing:oai:ir.lib.nchu.edu.tw:11455/43489 2023-05-15T15:52:29+02:00 Applications of carbonic acid solution for developing conversion coatings on Mg alloy Yu, B.L. 汪俊延 Lin, J.K. Uan, J.Y. 2010 http://hdl.handle.net/11455/43489 https://doi.org/10.1016/s1003-6326(09)60300-9 en_US eng #PLACEHOLDER_PARENT_METADATA_VALUE# Transactions of Nonferrous Metals Society of China Transactions of Nonferrous Metals Society of China, Volume 20, Issue 7, Page(s) 1331-1339. http://dx.doi.org/10.1016/s1003-6326(09)60300-9 1003-6326 http://hdl.handle.net/11455/43489 doi:10.1016/s1003-6326(09)60300-9 none Mg alloy AZ91D alloy corrosion conversion coating carbonic acid az91d magnesium alloy corrosion-resistance formation mechanism zn alloy film protection performance stannate cerium layer Journal Article 2010 ftnchunghsing https://doi.org/10.1016/s1003-6326(09)60300-9 2021-06-26T20:26:05Z Works on exploring an environmentally clean method for producing an Mg,Al-hydrotalcite (Mg(6)Al(2)(OH)(16)CO(3)center dot 4H(2)O) layer and/or calcium carbonate (CaCO(3)) layer on Mg alloy in a carbonic acid solution system (aqueous HCO(3)(-)/CO(3)(2-) or Ca(2+)/HCO(3)(-)) at 50 degrees C were reviewed. Conversion treatment for the Mg,Al-hydrotalcite conversion coating was as follows. Mg alloy was treated first in acidic HCO(3)(-)/CO(3)(2-) aqueous for precursor layer formation on Mg alloy surface and then in alkaline HCO(3)(-)/CO(3)(2-) aqueous to form a crystallized Mg,Al-hydrotalcitc coating. Duration of an Mg,Al-hydrotalcite coating on Mg alloy surface was reduced from 12 h to 4 h by the conversion treatment. On the other hand, for reducing the formation time of CaCO(3) coating on Mg alloy, the aqueous Ca(2+)/HCO(3)(-) with a saturated Ca(2+) content was employed for developing a CaCO(3) coating on Mg alloy. A dense CaCO(3) coating could yield on Mg alloy surface in 2 h. Corrosion rate (corrosion current density, J(corr)) of the Mg,Al-hydrotalcite-coated sample and CaCO(3)-coated AZ91D sample was 7-10 mu A/cm(2), roughly two orders less than the J(corr) of the as-diecast sample (about 200 mu A/cm(2)). No corrosion spot on the Mg,Al-hydrotalcite-coated sample and CaCO(3)-coated sample was observed after 72 h and 192 h salt spray test, respectively. Article in Journal/Newspaper Carbonic acid National Chung Hsing University Institutional Repository - NCHUIR Transactions of Nonferrous Metals Society of China 20 7 1331 1339 |
institution |
Open Polar |
collection |
National Chung Hsing University Institutional Repository - NCHUIR |
op_collection_id |
ftnchunghsing |
language |
English |
topic |
Mg alloy AZ91D alloy corrosion conversion coating carbonic acid az91d magnesium alloy corrosion-resistance formation mechanism zn alloy film protection performance stannate cerium layer |
spellingShingle |
Mg alloy AZ91D alloy corrosion conversion coating carbonic acid az91d magnesium alloy corrosion-resistance formation mechanism zn alloy film protection performance stannate cerium layer Yu, B.L. 汪俊延 Lin, J.K. Uan, J.Y. Applications of carbonic acid solution for developing conversion coatings on Mg alloy |
topic_facet |
Mg alloy AZ91D alloy corrosion conversion coating carbonic acid az91d magnesium alloy corrosion-resistance formation mechanism zn alloy film protection performance stannate cerium layer |
description |
Works on exploring an environmentally clean method for producing an Mg,Al-hydrotalcite (Mg(6)Al(2)(OH)(16)CO(3)center dot 4H(2)O) layer and/or calcium carbonate (CaCO(3)) layer on Mg alloy in a carbonic acid solution system (aqueous HCO(3)(-)/CO(3)(2-) or Ca(2+)/HCO(3)(-)) at 50 degrees C were reviewed. Conversion treatment for the Mg,Al-hydrotalcite conversion coating was as follows. Mg alloy was treated first in acidic HCO(3)(-)/CO(3)(2-) aqueous for precursor layer formation on Mg alloy surface and then in alkaline HCO(3)(-)/CO(3)(2-) aqueous to form a crystallized Mg,Al-hydrotalcitc coating. Duration of an Mg,Al-hydrotalcite coating on Mg alloy surface was reduced from 12 h to 4 h by the conversion treatment. On the other hand, for reducing the formation time of CaCO(3) coating on Mg alloy, the aqueous Ca(2+)/HCO(3)(-) with a saturated Ca(2+) content was employed for developing a CaCO(3) coating on Mg alloy. A dense CaCO(3) coating could yield on Mg alloy surface in 2 h. Corrosion rate (corrosion current density, J(corr)) of the Mg,Al-hydrotalcite-coated sample and CaCO(3)-coated AZ91D sample was 7-10 mu A/cm(2), roughly two orders less than the J(corr) of the as-diecast sample (about 200 mu A/cm(2)). No corrosion spot on the Mg,Al-hydrotalcite-coated sample and CaCO(3)-coated sample was observed after 72 h and 192 h salt spray test, respectively. |
format |
Article in Journal/Newspaper |
author |
Yu, B.L. 汪俊延 Lin, J.K. Uan, J.Y. |
author_facet |
Yu, B.L. 汪俊延 Lin, J.K. Uan, J.Y. |
author_sort |
Yu, B.L. |
title |
Applications of carbonic acid solution for developing conversion coatings on Mg alloy |
title_short |
Applications of carbonic acid solution for developing conversion coatings on Mg alloy |
title_full |
Applications of carbonic acid solution for developing conversion coatings on Mg alloy |
title_fullStr |
Applications of carbonic acid solution for developing conversion coatings on Mg alloy |
title_full_unstemmed |
Applications of carbonic acid solution for developing conversion coatings on Mg alloy |
title_sort |
applications of carbonic acid solution for developing conversion coatings on mg alloy |
publishDate |
2010 |
url |
http://hdl.handle.net/11455/43489 https://doi.org/10.1016/s1003-6326(09)60300-9 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# Transactions of Nonferrous Metals Society of China Transactions of Nonferrous Metals Society of China, Volume 20, Issue 7, Page(s) 1331-1339. http://dx.doi.org/10.1016/s1003-6326(09)60300-9 1003-6326 http://hdl.handle.net/11455/43489 doi:10.1016/s1003-6326(09)60300-9 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/s1003-6326(09)60300-9 |
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Transactions of Nonferrous Metals Society of China |
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20 |
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7 |
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1331 |
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1339 |
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